Nut-lock.



PATENTED JUNE 9, 1903.

No. 730,599. Y

' M. BARTLEY NUT LOCK. APPLIUATION FILED JAN. 15. 1903 no momzL.

UNITED STATES Patented June 9, 1903.

MILTON BARTLEY, OF PITTSBURG, PENNSYLVANIA.

NUT-LOCK.

SPECIFICATION forming part of Letters Patent No. 730,599, dated June 9,1903.

V Application filed January 15, 1903. Serial No. 139,091. (No model.)

To all whom it may concern.-

Be it known that I, MILTON BARTLEY, a

citizen of the United States, residing at Pittsburg, in the county ofAllegheny and State of Pennsylvania, have invented certain new anduseful Improvements in Lock-Nuts, of which the following is aspecification, reference being had therein to the accompanying drawings.

Figure 1 is a longitudinal sectional view of my improved lockingmechanism applied to a bolt, the locking-bushing and its turning-nutbeing in section, indicated by the line I I of Fig. 2. Fig. 2 is an endview thereof. Fig. 3 is a View similar to Fig. 1, but at right anglesthereto, as indicated by the line III III of Fig. 2. Fig. 4: is avertical cross-sectional view on the line IV IV of Fig. 3. Fig. 5 is anouter face view of the nut detached. Fig. 6 is a perspective view of thelocking-bushing detached. Fig. 7 is an end view of the hushing, showinga modified arrangement of ihe turning-lugs. V 7

My invention relates to an improved device for tightening and holdingbolts or other similar threaded elements; and it consists of a dividedthreaded bushing and a surrounding turning-nut adapted to engage thebushing and to rotate it upon the threads of the bolt, the meeting facesof the bushing and nut being inclined or tapered, whereby inward travelof the bushing will cause it to bind against the interior of the nut inthe manner of a wedge, whereby the bushing is caused to tightly grip thethread of the bolt.

The invention especially relates to the construction of the nut andbushing, whereby the nut imparts motion to the bushing in a positiveefiicient manner, so as to equalize the strain and permit oflongitudinal travel and also insure efficient gripping action.

Referring to the drawings, 2 is a bolt provided with the usual threadedextremity 3 of uniform pitch.

4 is a bushing having a couifor'm or exteriorly-tapered bearing face 5,adapted to be engaged by the similarinteriorly-tapered face of the nutand divided throughout its length at one side by a longitudinal slot 6.On each side of the bushing are exterior longitudinal lugs 7 7, alsotapered, each of which lugs or abutments is arranged on each side of theof its resilient sides.

bushing, respectively, to one side and theof it for the purposehereinafter explained.

8 is a turning-nut of hexagonal, square, or

other suitable form, adapted to he engaged by a wrench or spanner, theinterior of the nut being tapered inwardly, as shown at 9, and providedon its inner opposing sides with two or more longitudinal keyways orchannels 10, adapted to embrace and engage the lugs 7 of the bushing.These keyways or channels are slightly larger than the lugs 7, so as tomake an easy fit thereon and to permit-of the expansion or contractionof the bushing under compressing or releasing action when the nut isscrewed onto or away from the bolt. A particular advantage in arrangingthe lugs of the bushing on either side of slot 6 is that equal pressurewill be exerted upon the lugs, and the bushing will be free to close inupon the bolt in the action of turning, power being thus applied equallyto each This is of great advan tags and largely contributes to theefficient operation of the device.

While I prefer to taper the lugs 7 and channels 10 at the same degree asthe tapering faces 5 and 9,good results may be had by making the lugsand channels parallel, if desired.

I am aware that it. is not broadly new to provide nut-locking devicesemploying a tapered divided bushing and a surrounding interiorly-taperedturning-nut, as shown in patents of Whitmarsh, No. 205,712; Blighton,No. 287,796; Lee, No. 463,521, and Garvin, No. 526,308, and I am alsofamiliar with the construction of patentof Wilson, No. 622,307. Thelatter patent provides a construction wherein a key or feather Dprojects into a longitudinal slot 13 of the bush A; but suchconstruction tends to expand the bush by bearing upon one side only ofthe bush at the same time that the turning action of the nut tends tocompress it, which renders the operation very difficult and requiresconsiderable power. My invention overcomes this difficulty, while givinga much better holding action and symmetrical distribution of the power,preventing unnecessary binding or friction, and insuring efficientoperation and holding action at all times. The construction alsocontributes largely to cheapness and simplicity of manufacture by reasonof the ease of making the channels 10 in the nut and of the longitudinallugs 7 of the bushing.

The device is very simple and compact and when screwed down to theexterior of the bushing is only slightly above the outer surface of thenut, clearance being provided at its inner end for further tightening,While the equal forwardly turning operation of the channels and the lugsinsures free action of the bushing, resulting in a very tight grippingaotion upon the bolt and insuring against loosening or displacementunder jarring shocks or various other strains.

Having described my invention, What I claim is 1. A nut-lock deviceconsisting of an interiorly-threaded bushing, having a full-lengthdividing-slot, a tapered exterior, and longitudinal rounded lugsdisposed at each side of the slot; and a surrounding nut having acorrespondingly tapered interior, adapted to bind upon the taperedportion of the bushing, and longitudinal rounded channels adapted tofreely engage the lugs and exert turning pressure upon them equallyinadirection toward and from the slot respectively, substantially as setforth.

2. A nut-lock device consisting of an interiorly-threaded bushing,having a full-length dividing-slot, a tapered exterior, and longitudinaltapered rounded lugs disposed at each side of the slot; and asurrounding nut having a correspondingly-tapered interior, adapted tobind upon the tapered portion of the bush-'

